Buggy code:
BindingResolver getBindingResolver ( ) { } NodeEventHandler getEventHandler ( ) { } void setEventHandler ( NodeEventHandler eventHandler ) { } int getDefaultNodeFlag ( ) { } void setDefaultNodeFlag ( int flag ) { } void setOriginalModificationCount ( long count ) { } public ITypeBinding resolveWellKnownType ( String name ) { } void setBindingResolver ( BindingResolver resolver ) { } void unsupportedIn2 ( ) { } void supportedOnlyIn2 ( ) { } private static final Class [ ] AST_CLASS = new Class [ ] { AST . class } ; private final Object [ ] THIS_AST = new Object [ ] { this } ; static final int RESOLVED_BINDINGS = - 2147483648 ; private int bits ; public ASTNode createInstance ( Class nodeClass ) { } public ASTNode createInstance ( int nodeType ) { } public SimpleName newSimpleName ( String identifier ) { } public QualifiedName newQualifiedName ( Name qualifier , SimpleName name ) { } public Name newName ( String [ ] identifiers ) { } Name internalNewName ( String [ ] identifiers ) { } public Name newName ( String qualifiedName ) { } public SimpleType newSimpleType ( Name typeName ) { } public ArrayType newArrayType ( Type componentType ) { } public ArrayType newArrayType ( Type elementType , int dimensions ) { } public PrimitiveType newPrimitiveType ( PrimitiveType . Code typeCode ) { } public ParameterizedType newParameterizedType ( Type type ) { } public QualifiedType newQualifiedType ( Type qualifier , SimpleName name ) { } public WildcardType newWildcardType ( ) { } public CompilationUnit newCompilationUnit ( ) { } public PackageDeclaration newPackageDeclaration ( ) { } public ImportDeclaration newImportDeclaration ( ) { } public TypeDeclaration newTypeDeclaration ( ) { } public MethodDeclaration newMethodDeclaration ( ) { } public SingleVariableDeclaration newSingleVariableDeclaration ( ) { } public VariableDeclarationFragment newVariableDeclarationFragment ( ) { } public Initializer newInitializer ( ) { } public EnumConstantDeclaration newEnumConstantDeclaration ( ) { } public EnumDeclaration newEnumDeclaration ( ) { } public TypeParameter newTypeParameter ( ) { } public AnnotationTypeDeclaration newAnnotationTypeDeclaration ( ) { } public AnnotationTypeMemberDeclaration newAnnotationTypeMemberDeclaration ( ) { } public Modifier newModifier ( Modifier . ModifierKeyword keyword ) { } public List newModifiers ( int flags ) { } public BlockComment newBlockComment ( ) { } public LineComment newLineComment ( ) { } public Javadoc newJavadoc ( ) { } public TagElement newTagElement ( ) { } public TextElement newTextElement ( ) { } public MemberRef newMemberRef ( ) { } public MethodRef newMethodRef ( ) { } public MethodRefParameter newMethodRefParameter ( ) { } public VariableDeclarationStatement newVariableDeclarationStatement ( VariableDeclarationFragment fragment ) { } public TypeDeclarationStatement newTypeDeclarationStatement ( TypeDeclaration decl ) { } public TypeDeclarationStatement newTypeDeclarationStatement ( AbstractTypeDeclaration decl ) { } public Block newBlock ( ) { } public ContinueStatement newContinueStatement ( ) { } public BreakStatement newBreakStatement ( ) { } public ExpressionStatement newExpressionStatement ( Expression expression ) { } public IfStatement newIfStatement ( ) { } public WhileStatement newWhileStatement ( ) { } public DoStatement newDoStatement ( ) { } public TryStatement newTryStatement ( ) { } public CatchClause newCatchClause ( ) { } public ReturnStatement newReturnStatement ( ) { } public ThrowStatement newThrowStatement ( ) { } public AssertStatement newAssertStatement ( ) { } public EmptyStatement newEmptyStatement ( ) { } public LabeledStatement newLabeledStatement ( ) { } public SwitchStatement newSwitchStatement ( ) { } public SwitchCase newSwitchCase ( ) { } public SynchronizedStatement newSynchronizedStatement ( ) { } public ForStatement newForStatement ( ) { } public EnhancedForStatement newEnhancedForStatement ( ) { } public StringLiteral newStringLiteral ( ) { } public CharacterLiteral newCharacterLiteral ( ) { } public NumberLiteral newNumberLiteral ( String literal ) { } public NumberLiteral newNumberLiteral ( ) { } public NullLiteral newNullLiteral ( ) { } public BooleanLiteral newBooleanLiteral ( boolean value ) { } public Assignment newAssignment ( ) { } public MethodInvocation newMethodInvocation ( ) { } public SuperMethodInvocation newSuperMethodInvocation ( ) { } public ConstructorInvocation newConstructorInvocation ( ) { } public SuperConstructorInvocation newSuperConstructorInvocation ( ) { } public VariableDeclarationExpression newVariableDeclarationExpression ( VariableDeclarationFragment fragment ) { } public FieldDeclaration newFieldDeclaration ( VariableDeclarationFragment fragment ) { } public ThisExpression newThisExpression ( ) { } public FieldAccess newFieldAccess ( ) { } public SuperFieldAccess newSuperFieldAccess ( ) { } public TypeLiteral newTypeLiteral ( ) { } public CastExpression newCastExpression ( ) { } public ParenthesizedExpression newParenthesizedExpression ( ) { } public InfixExpression newInfixExpression ( ) { } public InstanceofExpression newInstanceofExpression ( ) { } public PostfixExpression newPostfixExpression ( ) { } public PrefixExpression newPrefixExpression ( ) { } public ArrayAccess newArrayAccess ( ) { } public ArrayCreation newArrayCreation ( ) { } public ClassInstanceCreation newClassInstanceCreation ( ) { } public AnonymousClassDeclaration newAnonymousClassDeclaration ( ) { } public ArrayInitializer newArrayInitializer ( ) { } public ConditionalExpression newConditionalExpression ( ) { } public NormalAnnotation newNormalAnnotation ( ) { } public MarkerAnnotation newMarkerAnnotation ( ) { } public SingleMemberAnnotation newSingleMemberAnnotation ( ) { } public MemberValuePair newMemberValuePair ( ) { } void recordModifications ( CompilationUnit root ) { if ( ( this . modificationCount ) != ( this . originalModificationCount ) ) { throw new IllegalArgumentException ( "AST<seq2seq4repair_space>is<seq2seq4repair_space>already<seq2seq4repair_space>modified" ) ; } else if ( ( this . rewriter ) != null ) { throw new IllegalArgumentException ( "AST<seq2seq4repair_space>modifications<seq2seq4repair_space>are<seq2seq4repair_space>already<seq2seq4repair_space>recorded" ) ; } else if ( ( ( root . getFlags ( ) ) & ( ASTNode . PROTECT ) ) != 0 ) { throw new IllegalArgumentException ( "Root<seq2seq4repair_space>node<seq2seq4repair_space>is<seq2seq4repair_space>unmodifiable" ) ; } else if ( ( root . getAST ( ) ) != ( this ) ) { throw new IllegalArgumentException ( "Root<seq2seq4repair_space>node<seq2seq4repair_space>is<seq2seq4repair_space>not<seq2seq4repair_space>owned<seq2seq4repair_space>by<seq2seq4repair_space>this<seq2seq4repair_space>ast" ) ; } this . rewriter = new InternalASTRewrite ( root ) ; <START_BUG> this . setEventHandler ( this . rewriter ) ; <END_BUG> } TextEdit rewrite ( IDocument document , Map options ) { } public boolean hasResolvedBindings ( ) { } public boolean hasStatementsRecovery ( ) { } public boolean hasBindingsRecovery ( ) { } void setFlag ( int newValue ) { } }

Fix:
setEventHandler ( this . rewriter ) ;